<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px' ">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <el-menu background-color="#333744"
                 text-color="#fff"
                 active-text-color="#409EFF" unique-opened
                 :collapse = "isCollapse" :collapse-transition="false" router
                 :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + '' " v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模块区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
              <el-menu-item :index=" '/' + subItem.path+ '' " v-for="subItem in item.children" :key="subItem.id"
                            @click="saveNavState('/' + subItem.path)">
                <template slot="title">
                  <!-- 图标 -->
                  <i class="el-icon-menu"></i>
                  <!-- 文本 -->
                  <span>{{subItem.authName }}</span>
                </template>
              </el-menu-item>
          </el-submenu>
        </el-menu>

      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
  export default {
    data () {
      return {
       //  左侧菜单
       menulist: [],
        iconsObj: {
         125: 'iconfont icon-xingmingyonghumingnicheng',
         103: 'iconfont icon-kongjian',
         101: 'iconfont icon-shangpin-copy',
         102: 'iconfont icon-danju',
         145: 'iconfont icon-chart-fill'
        },
        //  是否折叠
        isCollapse: false,
        //  被激活的链接地址
        activePath: ''
      }
    },
    created () {
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
      logout() {
        // 清空token
        window.sessionStorage.clear()
        // 跳转到登录页
        this.$router.push('/login')
      },
      //  获取所有的菜单
      async getMenuList () {
        const { data: res } = await this.$http.get('menus')
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.menulist = res.data
//        console.log(res)
      },
      //  点击按钮，切换菜单的折叠与展开
      toggleCollapse () {
        this.isCollapse = !this.isCollapse
      },
      //  保存链接的激活状态
      saveNavState (activePath) {
        window.sessionStorage.setItem('activePath', activePath)
        this.activePath = activePath
      }
    }
  }
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }

  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
      display: flex;
      align-items: center;
      span {
        margin-left: 15px;
      }
    }
  }

  .el-aside {
    background-color: #333744;
    .el-menu {
      border-right:0;
    }

  }

  .el-main {
    background-color: #eaedf1;
  }
  .iconfont {
    margin-right:10px;
  }
  .toggle-button{
    background-color: #4a5064;
    font-size:10px;
    line-height:24px;
    color:#fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
